When Adrian and Felix are on their moped chasing down Lucia's captors in the white van, Adrian is clearly driving in the beginning. He drives up on the moped, picks Felix up, and speeds away to follow the white van. However, a minute later within the same chase sequence, we see Felix driving the moped instead, with Adrian sitting on the back.
At the end of the movie, when Lucía is typing on an indigo Macintosh iBook, the "Capitals Lock" is on (as you can tell by the green LED) although close up shots of the screen show text being typed in lowercase letters.