When Betsy and Arlene are going back on the bus and their teacher is lecturing them, in the background of the bus there is a girl with big shiny blue glasses on which disappear and reappear between shots.
Despite the movie starting in 1972 and moving into 1973, the newspaper showing the headline about the meeting with Leonid Brezhnev shows a 1974 date and a 1974 copyright line. Newspaper headlines about subsequent events in the movie have 1973 dates.
When Arlene is hiding under Haldeman's desk in his home, the calendar shows April. A few scenes later there is a newspaper dated March 23, 1973 announcing that the White House knew of the burglary.
When Arlene approaches Chip as he's washing his car on a dry day, the hem of her dress is already wet.
A security guard is shown discovering the Watergate break-in. In real life, the guard was a Black named Frank Wills. However, the actor who portrays him is Caucasian.
The Watergate burglary that resulted in the arrest of five suspects took place on Saturday, June 17, 1972 at around 2:30 AM. In the movie, the girls are on a school field trip to the White House that morning (The radio announcement said the burglary happened last night). That would make the day of the field trip a Saturday. School field trips do not happen on Saturdays. Furthermore, since the burglary happened on June 17, school would be out for the summer.
When the girls first meet President Nixon there is a conversation about the Vietnam War. They say to blame Johnson and someone says that he is dead and someone else says thank God. Johnson died in January 1973 and the scene was supposed to be right after the break in which was June 1972.
Bobby Sherman got married in 1971, so a "Win a Date with Bobby Sherman" contest would have been out of the question in 1972.
Checkers died in 1964, about a decade before the events of this movie.
Arlene Lorenzo is shown in the Oval Office singing Olivia Newton-John's "I Honestly Love You," which was not released until 1974.
Although the movie is set in 1972-73, Betsy's family is seen driving in a 1975 model Ford LTD Country Squire station wagon.
Larry Jobs is said to become a millionaire by inventing Quaaludes, but Methaqualone was first introduced to the US market in 1965.
When Nixon is making his walk to the helicopter (after he has resigned) some of the Marine honor guard are holding M16A2 rifles (you can tell by the round hand grips); they were not used by the military until the early 1980's.
In the Watergate break-in scene, the camera is making the distinctive sounds of an auto-advance mechanism, but the photographer is manually advancing the film. Plus, there is no mechanism attached to the camera.