I'm surprised I couldn't find a board for this (and yes, I did use "Search"). If there's a better place, please feel free to redirect me.
In any case, here's my nit.
At the end, after Ace has rescued Snowflake and Dan Marino, Ace is on the sidelines at the Super Bowl. He has just spotted the bird he's been hunting on and off all movie, and is about to grab it, when the Philadelphia Eagles' mascot comes over for a drink of Gatorade.
However, the Eagles' mascot wouldn't be over on the Miami sidelines, he'd be on the other side of the field, on the Philly sideline.
Look out everyone, it's: ScottN, Mascot Detective!
The sequel
Ace Ventura: When Nature Calls
wasn't so great