Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Loss of 21 minutes from original = loss of coherence

I think South Pacific is second only to Sound of Music among movie musicals. The music and visuals are superb. The only real weakness is in the casting of John Kerr as the lieutenant. Unfortunately, videos of South Pacific, including this DVD, have been trimmed to 150 minutes from the original 171 minutes. There is some loss of coherence as a result. Why do they do this?