In the last shot of the film, as credits begin to roll and Ethan has finished singing his song, you can see several feet of the dolly track on the floor of the diner. One of the extras sitting in a booth even comes close to tripping over it. In the wide screen version of this film the dolly track is not visible.
When Jack is copying files off Angela's computer, he inserts an Iomega Zip disk, but the screen says "Drive: A". Drives A and B, when present, are always floppy drives (either 3.5" or 5.25"), never Zip drives.
When Ethan is video taping Angela and Dave next to the pool, he says his line next to the camera. When he is showing the video tape to Sam and Jeff, you can hear Angela's and Dave's voices clear from far away but you never hear Ethan's line.