at the end of the episode once Helen & Janet get found in the bushes, Helen says the door is locked.
Mr Roper asks about the housekey & Helen says 'where would I put it' ? Then once the girls have the towels, Mr Roper or Helen opens the door to the apartment. I don't see anyone taking a key out first.:happyface

Anything else???

Also in that episode...When Larry throws the towel at Janet and she reaches up to grab it, you can see she's already wearing a brown towel for a split second.

And right before that, when Mrs. Roper and Janet are talking with Jack from behind the bushes, you can see Larry waiting just behind the wall waiting to come back with the towels....for a second he flashes the yellow towel in the background.