And while we can attribute his hesitation to answer and his discomfort to the idiotic questions, there is another reason for his distress, as can be seen from this photo immediately before or during the interview:
(Getty Images claims this was an interview with Hamas TV before he was released, but no such interview seems to have occurred and the microphone, background wall and chair seem to match those in the Egyptian interview.)
UPDATE: AP verifies it was in Egypt:
UPDATE 2: AP wrote about it as well:
Armed Hamas militants were in the area during the interview. One of them stood behind Schalit's chair, wearing a a black face mask, a green headband of the Qassam brigades – Hamas' military wing – and a video camera in his hand.(h/t David)
UPDATE 3: The interviewer insists that Shalit wasn't pressured to do the interview. Yeah, right.