Mad Love (1995)

Deliberate mistake: When Matt is spying through the telescope on Casey's argument with her parents, you can hear Casey yelling "No no no" and hear her bedroom door slam, etc. This is all from Matt's point of view from the telescope - it would have been impossible for him to hear any of that, being such a far distance all the way across the lake.

Matt: I feel like an idiot.
Casey: You look like an idiot.
Matt: I am an idiot.