When Felix and Oscar are called out of the holding cell, Felix says "If we go down, you go down with us" to the truck driver. As he says this it cuts between two shots quickly, and in the first shot when he says, "If we go down ..." his mouth isn't moving.
Upon finally reaching the wedding in San Malina Felix is yelling at his ex-wife. He claims not to have seen her in half a century fifty years. Their daughter's got to be in her late twenties or mid thirties.
While riding with Oscar down the road, Felix states that they need to pull over so he can eat, because his blood sugar requires him to eat every four hours. Earlier in the drive, though, he says "I'm starving, I haven't eaten since last night." That would mean it's been well over four hours - closer to 16-20.
Just before getting into the rental car, Oscar is carrying both his and Felix's luggage. His own suitcase in his right hand and Felix's in his left hand. Oscar steps down a small staircase at the rent-a-car office and the suitcases switch hands in an instant.