NOTE: This is now only in the First American Edition.
In the chapter Priori Incantem, in the scene where Harry and Voldemort wands connect and the echos of previous spells done by Voldemort's wand appears, the echos appear out of order. The order of the echos are:
1. Cedric
2. The Riddle's Groundskeeper
3. Bertha
4. Father Potter
5. Mother Potter
But, according to everything we have read up to this point, it has been stated that Voldemort killed Harry's father first, and then killed his mother. When the echos came out of Voldemort's wand, Harry's father should have come after Harry's mother.