What can we say, Harry Potter universe is completely... Magical, duh. The film production team and crew had one hell of a job to bring this fictional wonderland to life. And for the most part, they did good, bless them.
That being said, an army of sharp-eyed potterheads over at Movie Mistakes managed to point out numerous continuity mistakes in all of the eight films. Rumour has it the producers of the film hunt them down by their IPs and cast unforgivable spells on them in revenge.
Are you brave enough to take this risk?