Visible crew/equipment: When Jesse and Becky are arguing by the waterfall, the shadow of the boom mike is visible on the rock behind Becky.
Revealing mistake: When Joey sees his girl (again) in the water and rushes out to hug her (and she disappears again), there's a large brick home visible in the background, on their "deserted island." (00:13:35)
Chosen answer: There are 4. The big room that DJ and Stephanie used with the big bay window. Next to that (closer to the main/front staircase) was the father's room (rarely seen). Across the hall were the rooms used Uncle Jesse (in the beginning of the show) and Michelle's baby room.
shortdanzr ★
But what about the 2 bedrooms in the attic?