They should have used colored contacts! I mean for seven years he was told he had his mothers eyes but when we see Lily in the final book they're different.And his eyes are supposed to be green,they never said he had his mother's GREEN eyes in the movie.
I am so ridiculously amused by Harry Potter humor! I love how you can take something so simple and turn it into a Harry Potter reference. And the best part is you can make fun of your friend for not knowing what the reference is.