Actor Eric McCormack is Canadian. Will, the character he plays, is not. Nonetheless throughout the series "Will" frequently lets slip with a Canadian accent, particularly on the stereotypical 'about', which he pronounces 'aboot'.
In the earlier series, the deadlock on Grace's office door is backwards. The door opens inwards yet the part of the lock where the key is required is on the inside of the office and the latch that can be opened by hand is on the outside - rendering the lock useless. This is corrected in later seasons.