I know there's a link to SLUGS in the Screenwriting Class FAQ but this is more specific to my script.

Would it be alright to use a mini-slug directly under a scene heading?

For example.

INT. BOB'S HOUSE - DAY

KITCHEN

Bob chops up vegetables.

The phone RINGS.

Bob moves into the...

HALLWAY

...where he answers the phone.

Would be that be alright?

Second problem I'm having is the TIME ELEMENT of the scene header, the idea of having to use CONTINUOUS or MOMENTS LATER shall we day.

If I establish a location, for example...

EXT. MEDICAL CENTRE - WAITING ROOM - DAY

Would I have to include the "DAY" part in the next scene i.e.

INT. DOCTOR'S OFFICE

...or would we just assume that's DAY as well? It just feels a bit odd putting DAY in every scene header.

Thirdly...

If I have a scene...

INT. SHOP - DAY


And I move back to the scene after a daydream, would it be...

INT. SHOP - MOMENTS LATER

Or...

INT. SHOP - DAY

...again?

I personally don't use mini slugs very often these days. If you have two houses, it can get confusing later down the line when it comes to writing out the shot list if you have minis everywhere.

I only use minis to help with pacing. If the writing needs to up tempo, or it flicks from one character to the next on opposite sides of the same scene. It loses some impact I feel if used too often. Like any tool, it's there to aid us when we need it, use it at the wrong time and it's useless.

In regard to using DAY repeatedly.... yes, you write DAY repeatedly. I do. It helps with clarity for all involved.

In regard to the daydream, I would handle that similar to a flashback, although rather than write BEGIN FLASHBACK: I would write BEGIN DAYDREAM: blah, blah, blah BACK TO SCENE.

The important thing is clarity.

Clarity and consistency.

Don't use the mini slugs unless you have a lot of back and forth within that location. For example if there was 3 or 4 things going on simultaneously in the house, in the hallway, the bedroom, attic, and kitchen then mini slugs help give the reader direction so they don't get lost.

Don't use moments later. I think most time when it applies you get the same idea by having a slug without it. The absence of a continuous is kinda like a moments later if you think about it.

And continuous doesn't mean next. it means continuous. If there'es even 30 seconds delay between your two scenes then a continuous wouldn't work.

Hope that helps.

I used FLASHBACK in the scene header...

INT. MARK'S APARTMENT - NIGHT [FLASHBACK]

But later on I used...

BEGIN FLASHBACK: because I was using multiple locations, not sure if I need to change that but it might be seen as lack of consistency.

I didn't know BEGIN DAYDREAM: was a thing, guess I'll use that instead because it's slightly different than a flashback afterall

If you write a Full Slug, you need to include the place and the time.  Don't skip the time element just because you think it's redundant.

Do not use a Mini Slug directly below a full Slug...EVER!  It's foolish.  Set the scene with an accurate Full Slug.

Using CONTINUOUS in a Full Slug means what it says, like Cameron noted.  There's nothing wrong with using CONTINUOUS, but make sure it really is continuous.

There's nothing wrong with using MOMENTS LATER, as long as that's truly what it is.

Time is important in scripts and movies.  In movies, we can hopefully see or at least relaize the passing time.  It's much harder in a script, so using solida time elements in your Slugs is paramount.

For Flashbacks or the like, use - BEGIN FLASHBACK.  ONce you've done that, you can change Slugs within the Flashback.  When you're done with the Flashback, use - END FLASHBACK.  You'll be in the Slug where the FLashback began.

Hope that helps.

I think the responses you got pretty much nail it.

For me personally, it is a matter of flow and ease of read. If a full scene heading doesn't interrupt to flow - I see no reason for mini slugs and vice versa. For example, if a man is walking through a house and there is material action or dialogue in the different rooms, then I will use the full scene heading. Conversely, if a man is doing something like chasing a cat throughout the house (i.e., the action is brief and similar in each of the locations, then I like to use minis because, IMO, the full heading interrupts the flow.  

One last nit and this is not at all a technical one - it is just a personal preference. I do use a rule of proximity. i.e., if a man walks from one room to the adjacent room (e.g., kitchen to dining room) I might use a mini. But if a man walks from the kitchen - upstairs to the bedroom I won't as I find that in most case I don't need the stairs anyway (this might not make sense - but I hope it comes across).