Natalie and Jaime,
Lol, you two. Jaime, the Amberson trailer should be on the first tape I sent you about a year and a half ago, right after the Houseman South Bank Show. I got it off Turner's latest VHS edition of Ambersons.
I wouldn't say there's "tons" of missing Ambersons footage, but there are a few fascinating snippets, including two critical ones from the boardinghouse scene. The first is a closeup of Fanny looking impatiently off to the left. This comes right after Eugene has gotten up to turn off the skipping comic record. I believe the closeup of Fanny in the trailer was accompanied by the line, "Think they'll get married, after all?", apparently referring to George and Lucy, but from the expression on her face, possibly meaning herself and Eugene as well.
The second bit shows Eugene walking in front of Fanny as his shadow passes across her. I believe this was accompanied by the climactic line, "You know, Fanny, I wouldn't tell this to anyone but you..."
I posted a description of the boardinghouse ending awhile ago, in one of the other threads, I forget which.
The bit of George leaving Isabel's bedroom comes right after he has thrown Eugene's letter into the fire and demanded to know what kind of response Isabel was going to make to such an insulting letter. It was accompanied by the George's line "If he ever set foot in this house again...I can't speak of it". Isabel looks straight ahead tearfully, not catatonically.