It was in the part where Merry and Pippin were singing in the bar. I never watched the extended version of the movie. I just found that part on YouTube
I remember watching that and immediately thinking it was because Gandalf took the palantir from him; it’s like, Pippin may have felt that Gandalf didn’t think he could handle it, or that it may have been a bit of a blow to his pride? Idk
Yes, Pippin was miffed at Gandalf for taking away the palantír when he was drawn towards it and Gandalf was miffed at him for touching it. I didn't get it the first time I watched it! 😄