Thanks for all the helps guys. I'm still not sure how to go about the flashback thing though, because I number my scenes you see...so right now I would probably do it like this...
SCENE 1. INT. SHOP - DAY
MAN: Hey nice coat!
WOMAN: That's my wedding dress
(Warning that is not my actual Scene I just made that up)
CUT TO:
SCENE 2. INT. FLAT - FLASHBACK
MAN: Will you marry me?
WOMAN: Get up you fool, we're already married
(Warning, once again just making this up as I go along)
SCENE 3. INT. SHOP - DAY
MAN: Oh I thought it was your coat, I'm sorry.
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Don't know why that wedding theme took over there. But yeah, that to me looks confusing because Scene 1 and Scene 3 are suppose to be happening at the same time but marking it as Scene 3 seems to suggest its moved on.
Oh and in response to Ed Parnell, the caption thing is only going to be used at the beginning of the pilot episode when we first meet the characters, its because I'm doing a 'big cast' sitcom, so this will give an idea of how these characters link to each other.