Watch Meet the Robinsons on your DVD player, and pay attention to when Lewis finally gets his memory machine to work. (Note: This is near the end of the movie) The memory machine plays Lucille's memory of her wedding day, and, at the altar, is Bud. Bud is wearing his clothes backwards, and there is a smiley face on the back of his head. He also has very little hair left (there is only a small shock of hair over each of Bud's ears)

Now, go forward to the place where Bud and Lucille are taking Lewis home from the orphanage. We can clearly see the back of each characters head, and Bud's head has a rather large amount of hair where, in the memory machine, there wasn't any. How did he get that much hair back?