As I go...

"REDHEAD" - ?  WTF?  Human?  Man/woman/child?  That's a very poor start.

"he’s enjoyed the 60s, and is set for the 70s." - Oh no...here we go again.  I honestly don't understand writer's fascination with cheesy, dumbass asides.

"A crowd of concerned CITIZENS barrage SHERIFF WEST, 50s, tired and ready for early retirement, with questions." - Oh fuck...really?  Does this read incredibly awkward to you?  Do you find it funny?  Correct answers are "yes" and "no".

OK, enough.  I can't put myself through another script like this, which is 3 in a row written in a style that is so irritating.  Bigger problem is this ain't funny, nor is it fun.  I'm not sure if it's supposed to be a pisser or just a poor attempt at comedy.

I'm out.

Funny stuff. The whole mental picture of a "monster bunny" is a kick.
Some colorful description. The dialogue is rather like a Jason Segel/James Franco movie. And those make a lot of money!

Didn’t read the logline so I had no idea who Brock and Lucas were. They just sort come out of nowhere to solve crimes, like the Hardy Boys. It could use more detail there.

Unfortunately the jokes never really connected for me and they seemed to push the story out. Seems like it was trying to find the story in the humor rather than the humor in the story. Not much I can think to add. It’s simply a miss for me.

Well,this was definitely goofy. Cartoony characters. I like the 70's vibe. It was entertaining. Not hysterical but amusing. I thought it went on a little long though. The writing was good, only a few awkward phrases. Seems like you had fun with it.

Writing style:
The whole thing was a smooth sail except for the likes of these two instances:

Quoted Text -- a talking bunny, now that would be stupid

Quoted Text Yeah, like the Bunny gives a fuck.

There is no point to those sentences. Unfilmables can be used only when there is a valid point for it.

Dialogue:
Well written but some lines sounded odd considering the period of time the story took place in, like:
"Holly shit!..."

Characters:
I liked them. But you didn't made an effort what their personality is really like. I mean most of their reactions were average. It didn't have a unique fingerprint to it.

I thought Brock was the only one that had an intriguing personality, but only when he faced the bunny, which was too late. We need to know your character earlier in the script.
Lucas could have had more depth. The rest for me was nothing than stick figures.

Story:
The idea is interesting. It hooked me when I knew Brock was planning some kind of scam. I was disappointed, cheated even, to know that he never had or at least we will never know. You used "What's the score?" just to lure us into turning pages, no more. It was a bad decision. Never put a setup without a pay-off. You will piss the reader/audience.
After they encountered the bunny, it was cliches fest.

Overall:
The story had some great potentials. It deserves a rewrite, and I can tell from the script I just read that you had potentials yourself as a writer.

It might just be a taste thing but I didn't get this. It felt like it was trying really hard to be funny but none of the jokes were connecting. I got bored pretty quickly but kept reading to see if some sort of twist or payoff could redeem it, but it didn't. And the whole thing felt way too long.

BROCK MCLEAN VS THE FAIRFAX BUNNY

Why is the opening shot 1970?

So, you'll need a CGI Bunny here. Don't know if this is possible but I liked all those visuals and fight scenes.

(@ I had a thought now how to solve this problem: While I think you tried to make this detective journey quite esthetically from the visual aspect, maybe there's the chance to one time go crazy and just give a trash film look to the bunny, for example just a costume, it's a big man in a suit-- then Brock still fights it as if it was a giant rabbit for real, as if it's still the big world-class final enemy. I think it could work, it even fits to your ironic characters. You know what I mean?)

I liked the script a lot. It's a comedic homage to the genre including the over the top clichéd characterizations of the hard guy and his helpless sidekick, the girl deputy for the romance and the stubborn Sheriff who tries hard to mark his terrority toward the new cops in town.

I definitely go with it.

Things always go shorter though. Great stuff - Nothing more to say here.

Turn off your program's unnecessary “Mores and Continueds” feature.make
Well… this was a fine display of some very competent writing.
All the required marks and high points are there in this story.
It’s just, for me, lacking that “magic sauce”, nothing I can really point a finger at and say “There! Fix that and all will be well.” Juno?
It’s good. It’s a good story.

LMAO! Some of you writers must not have a sense of humor.

Anna Del Amico, this was hilarious from FADE IN to FADE OUT. The soundtrack (although you normally don't write the music into the script unless it's necessary, a la American Graffiti or a musician biopic) was awesome and set the mood, even if it was anachronistic. (Then again, The Wonder Years episode, "The Accident," anachronistically uses Bob Seger's "We Got Tonight." But that was before the Internet.)

The bold slugs make me cringe.

The Andy Taylor, Barney Fife, and Bugs Bunny references were hilarious.

Code A talking bunny? Now that would be fucking stupid.

This made me laugh out loud, but it's an unfilmable aside. Try to keep them to a minimum or just leave them out, preferably the latter.

I loved the description of the bunny.

RE: the redhead, I just assumed it was a woman. But you should have made it a little more clear: Species, gender, age? Pretty? Ugly? Fat? Bald? Glasses? Mustache? Beard?

Overall, I liked it. Ending with Spencer Davis (though, again, see above about writing in music, plus I don't know the song.) reminded me of Dazed & Confused closing with "Slow Ride."

Overall, I loved your screenplay. A solid A.