Gary Oldman's appearance was so different while in his makeup that the first time his co-stars saw him on the set, many of them did not recognize him.
While filming, Gary Oldman spent a lot of time with the twin girls playing the baby. He admitted to being homesick for his own children, so he gave the girls a "cuddle or a squeeze" whenever he could.
This is the second time that Skeet Ulrich played a character named Billy.