Audio problem: When She-Hulk says "Hey, Hulkster, having any fun?" and Hulk responds with "A blast, yeah," he is speaking in Abomination's voice.
Audio problem: When Abomination is saying "I can still take him," his mouth is not moving.
Audio problem: When Bruce Banner is saying "Why, did you have another weak spell?" his mouth movement is slightly out of sync with the dialogue.
Answer: The Hulk is a giant brute who smashes everything in his path when he is angry. In Ang Lee's "Hulk," General Ross, played by Sam Elliot, explains it to his daughter.