Corrected entry: When the movie begins and Jamal is brushing his teeth in his home, he is wearing light-blue pants. When Jamal is in 14th century in England, after the first execution in the movie, Jamal takes his jeans off and he is wearing black pants without changing his clothes at all.
Corrected entry: When Nolty has fainted near the lake, Jamal says: "He's not breathing." If you watch his stomach carefully, you will be able to see he is breathing.
Corrected entry: When Jamal reaches into the moat to retrieve the medallion and falls in, he is wearing a full body dark blue suit, but when he emerges he is wearing his outfit from that morning. I doubt he had time to change his clothes while transporting from worlds.