Q: How can you memorize all these complicated incantations used in the film?
Tom: Those incantations are based on Latin, and my grandfather is very good in Latin and he helped me a lot to get the meanings. In fact, he even corrected the spells written on the original script! He also had a nice, long white beard and so he was cast as one of the professors in Hogwarts in the first and second movie.

When asked to describe the other cast members, especially the trio, Tom answered amusingly, "Daniel is like a stand-up comedian, Rupert is rather shy, and Emma is fun to work with"; then the reporter picked up his remark on Daniel and asked him to talk about some specific funny episodes, which apparently Tom didn't expected. After a few moments of embarrassed smiles, Tom stammeringly described the episode in which Daniel often acts like one of the production crew and shouts, "Rolling!" behind the camera.