(at around 6 mins) When Duncan and Geoffrey are fencing, Geoffrey knocks over some candles with his sword, but in the next scene, they're all back on the candle holder.
When in the pub playing pool and Emma ex-boyfriend comes in and challenges Duncan, Duncan lays the pool cue on the table, but in the very next frame, during the confrontation, Duncan is holding the cue and lays it on the table again.
When Ducan takes Emma out for dinner, while sitting at the table, the candle on the table is lit when the view is over Duncan's shoulder, but it not lit when the view is over Emma's shoulder.
At the beginning of the movie, during the visual shots of downtown, the scenery shows a winter scene with mounds of snow but the outdoor thermometer showing 60 degrees F.
At the beginning when Prince Duncan is sneaking out of the castle, there is clearly a covered "Exit" sign above an entryway at the top of the stairs behind him.