Towards the end, while Isaac and Peter fight among the paintings, you see many times the one with Hiro and the T-Rex; however it is supposed to be in Vegas, carried by Hiro himself and torn in four pieces.
When Hiro is driving to the bus station with Gustafson he has the painting tube in his arms. However, when Ando and Hope pull into the bus station (in the next scene) the tube can be seen sticking up in the back window of the car.
When Noah Bennett is on the rooftop with the Haitian, and they find Claude and Peter with the heat vision goggles and taze them, Peter is somehow able to use his powers even though people have not been able to use their powers when they're around the Haitian in previous episodes.