Other mistake: The lead is loaned cassettes of 'Darkness on the Edge of Town' and 'Born in the USA' by his mate and then quotes a lyric from 'The River' which he hasn't listened to yet.
Other mistake: During one of the recording studio scenes, there's a short segment that shows a bunch of VU (audio level) meters close up. The very first meter in that sequence is not a VU meter. Its from of an old HF (High Frequency) Amateur Radio transceiver; The scale is marked for RF, SWR, and ALC. I'm suspecting that someone involved with the post production editing is a Ham.
Other mistake: The manager mentions that he is going to be on the late show on Friday and the "Meetings of All Meetings" on Saturday. In that meeting, the mention of the late show happens when it was supposed to have already taken place on that Friday after going to Liverpool. While it was a dream in the movie, the appearance was still supposed to happen. In the deleted scene, the late show happened but then this would have to have been before Liverpool instead of after, since this was a possible motivation.