Question: What happens when you call the number on Lucy's card? It is not a 555 number, so who answers?
Answer: If you dial the number (626-584-5723), it will reach an answering machine recording of Lucy Wilde asking if you want to apply for the Anti-Villain League.
Chosen answer: The car is always shown in shots from the front so we can't see if the boot had a leak.
boss of epicness
If the boot had a leak large enough to admit the starfish it would have filled with water and Gru would have drowned.