When Brandy gets out of the pool after "saving" Willy, he grabs her ankle. In the next few shots, the ankle he is holding changes from left to right several times.
The name of the country club is Oak Crest. In the end credits, any nameless characters associated with the country club are listed as Hillcrest, not Oak Crest.
The entries on Brandy's list appear, disappear and change order between shots as she writes it.
When they are first introducing the character of Willy, as he is waking up with his sunglasses on, someone hands him a beer, then, in the next shot, the beer that he is holding is gone & he is holding his sunglasses again.
The opening credits show a TI-83 Plus calculator, which was released in 2001.
In the theater, the Pepsi logo on a cup wasn't used until the late 90s.
The movie is set in 1993, but poster in Brandy's room is from the 22nd Telluride Bluegrass Festival (butterfly with a mandolin as the body) which was in June of 1995.
When Brandy tells Fiona that Fiona missed the turn, Brandy points forward and continues to point forward. If Fiona had missed the turn, they would have already passed it, so Brandy should be pointing backwards.
No trained lifeguard would jump into the water with a still-conscious drowning victim, particularly one who is twice their size.