When introducing Marta at about 10 minutes in, she is seen arriving in a red car. When it is approaching it is a boxy late 70s/early 80s Renault 5, but when it stops it is a roundish Fiat 500 from the 60s, which looks nothing at all like the car she came in.
When Fred and Ted are driving through Barcelona early in the film, Ted's driving barely matches the direction the car is moving.