Other mistake: Frankie tells Vanessa that he brings his son to the park on Saturdays and would like to meet her there. It shows in another scene from that day that Nikki, the foster child, had been in school that day so it couldn't have been a weekend day.
Other mistake: Vanessa has a son and daughter and Frankie has a son. When the kids are walking down the aisle it's two girls and one boy.