Other mistake: When Percy and Simon are driving to the hotel and it starts to rain, the rain is dripping downwards on the windshield. Normally when a car is driving the rain should be moving up (because of the wind).
Guess Who (2005)
1 other mistake - chronological order
Directed by: Kevin Rodney Sullivan
Starring: Ashton Kutcher, Zoe Saldana, Bernie Mac, Judith Scott
Continuity mistake: Percy's car isn't where he parked it when the camera goes to an aerial view after talking to Simon at the bus station.
Percy: I don't want to hear about you sleeping with my daughter - you're sleeping with me now.