Corrected entry: Several times during the film, set in the early 60's, Lenny the guitar player refers to Erie, Pennsylvania as Erie, PA. Guy Patterson, the drummer, refers to it as Erie, Penn. I believe Erie, Penn. would be more accurate. The two letter state abbreviations came much later than the early 60's.
Corrected entry: After the band first plays at Villapiano's, the bartender lines up a row of bills in front of Steve Zahn. He then turns one $5 bill sideways, saying it's the band's bonus. When the scene cuts back and forth from the bartender's view to Steve Zahn's - the $5 bill appears and disappears a couple times as the point of view changes.
Corrected entry: In the scene where Guy's family is watching the Wonders on TV, they are using a wireless remote control to adjust the TV. The film is supposed to take place in 1964, but wireless remote controls for televisions were not available until the 1970s.
Corrected entry: When the band wins the talent contest at the beginning, there is a shot where the owner of Villipiano's is asking if the guys would play at his place. One shot shows the bass player all smiley and then it immediately changes shots with him the background dead serious.
Corrected entry: When the band is at the hotel in Hollywood, a reporter asks them "Why don't you have long hair like The Beatles?" The movie is supposed to have taken place in 1964, The Beatles didn't have long hair at that time, it wasn't until a few years later.
Corrected entry: The scene on the Matterhorn at Disneyland shows that the car is two connected. In the early 60's it was a SINGLE car ride.
Corrected entry: In the scene where the guys are performing in Illinois the camera moves to an overhead shot and we can see the guys performing on a huge Playtone record. If you read carefully the Playtone record says that the song was written by James Mattingly III however, when the guys meet Saul Siler Jimmy introduces himself as James Mattingly the second.
Corrected entry: The father looks at an ad for a competing store which indicates the store is open on Sundays. If this is the mid 60's, Sunday sales were prohibited by law (the infamous blue laws). I don't believe the blue laws were abolished until after the date of this movie.
Corrected entry: The bass player and Faye are each listening to a "Walkman" to hear the song on the radio. The movie was set in 1964 and the "Walkman" was invented in the late 1970s.