Continuity mistake: Tom Riddle's uniform tie is different to the current ties in the first two Harry Potter films. Yet it matches the style of the students ties in the rest of the films. The mistake here is that Tom Riddle (at school) was before Harry's time at Hogwarts, but I guess when the costume department changed the ties, they didn't realise they should give Tom Riddle an older one as per the first two films.
MissQT
1st Jun 2012