Factual error: After trying unsuccessfully to call Katie at the all-night cafe, Boone questions where she could be at six in the morning. The scene occurs during broad daylight. If the time were accurate, this could not be so, since it occurred in November. (01:18:30)
Factual error: Bluto crushes a beer can against his forehead. Steel cans are too strong to crush like that. Aluminium cans weren't introduced until approximately 1965, although the movie was set in 1962. http://www.cancentral.com/brochure/historyTimeline_f.htm. (00:07:55 - 01:20:20)
Suggested correction: Maybe it's a joke about his thick skull/him being impervious to pain due to his stupidity/drunkenness? We also see him break bottles against his head with similar indifference and abandon.
Factual error: In the scene with the disciplinary meeting, the chalkboard says "Pan-Hellenic Disciplinary Council." National Pan-Hellenic Council is the governing body for sororities, not fraternities. Fraternity disciplinary hearings would be handled by either the Inter-Fraternity Council (IFC), or the school's Office of Student Conduct, in conjunction with the Director of Greek Affairs. Further to this error is that the rest of the chalkboard writing pertains to the meeting being held at that time, and Greg Marmalard calls the meeting of the "Disciplinary Council" to order. (01:01:25)
Suggested correction: Although correct the National Pan-Hellenic Council wouldn't be involved - it actually represents African American fraternities and sororities.
Other mistake: When Pinto throws rocks at the mayor's daughter's window, the first two rocks bounce off the window and don't get her attention. The third rock supposedly breaks the window. If you watch closely, you'll see the rock bounce off the window while a glass breaking sound is heard. Likewise, when the mayor's daughter opens the window, it is intact.
Suggested correction: Depending whether or not daylight savings time has ended at that point. If it has and the clocks are an hour earlier now, then it would be brighter by 6 a.m. then if they had not yet. There's no sun in the scene so this could explain it as a possibility.