Continuity mistake: On New Year's Eve when Lucy leaves her apartment to go to her friend's party, she meets Jack. On the ground is a significant amount of snow. When she gets to her friend's house, there is no snow anywhere to be seen. When she leaves her friend's house with Jack and is walking down the street, the snow is back. (01:00:00 - 01:02:00)
Continuity mistake: After Lucy stops the wedding and tells Jack that she is in love with him, they show Jack smiling and looking down. Behind him over his left shoulder, a man with a mustache and beard has appeared. He is not at the chapel before when they show the wide picture of the chapel, and then he is never seen again. (01:33:00)
Answer: Peter was being boxed out by the other guy, so the other guy was putting his back against Peter's front. With a pencil sticking out of his back pocket, you can imagine how some damage might be done.
Greg Dwyer