When the vampire is on the hood of Pike's car, his head is just barely on the windshield. However, in the next shot from Pike's view, the vamp's head is covering the entire windshield. This happens several times. See more...
Because of changes to the script Joss Whedon was forced to make by the studio, he doesn't consider the film canon as established by the TV series. See more...
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The entry you are changing the wording of is:
|Title||Buffy the Vampire Slayer|
|Original entry||Towards the end of the film when they are getting ready for a dance, a Pepsi can mysteriously moves around on the floor in front of Buffy's friend.|