Film debut of Aaron Taylor-Johnson
Sean Bean and Aaron Taylor-Johnson, respectively, have both portrayed Count Vronsky in Anna Karenina at one point.
In the Mirror Maze (at around 35 mins) and after, viewers should realize that although Tom and Thomas are wearing identical white corduroy jackets with hooded orange zippered liners, Thomas' liner is zipped up so his front is orange while Tom's liner is unzipped, so his front is black. A more subtle difference is that Thomas' hair is parted on his left while Tom's hair is parted in the middle. Viewers may confuse them before the Mirror Maze when, after Thomas and his father enter the Space Museum with tickets, Tom sneaks in (at around 34 mins) by calling out "Mom, wait for me", pretending she is ahead of him -- staff thinking he were Thomas would aid his ruse.