Corrected entry: Arthur realises that Brian Slade is actually Tommy Stone by recognising Brian's PA Shannon in a televised press conference. However, according to the story, Arthur never sees Shannon, much less on the morning after the orgy which he has a supposed flashback to, so how can he possibly recognise her 10 years later?
Correction: Arthur doesn't realize that Brian Slade is Tommy Stone because of Shannon. He makes the connection when the computer brings up Brian's full name: Thomas Brian Stoningham Slade.
Corrected entry: The first time we see The Flaming Creatures perform, the lead singer Malcolm, stumbles in his large boots and nearly falls over.
Correction: Malcolm is actually meant to do this. You can tell this as the "stumble" is part of the jerky dance routine that Malcome does throughout the performance.