One of the most noticeable differences is the casting. Since the original Grease was made in the late 70's, the cast probably wasn't up for a remake. Therefore it was an all new cast, but the casting was pretty accurate for the most part. The grease live cast was more ethnically diverse than the original cast, which was a good choice because you have actors like Vanessa Hudgens playing Rizzo. I really liked Vanessa Hudgens in this role because she really makes the whole "I don't care" attitude come alive, which is very reminiscent of the original.

Another difference is that because Grease live was airing earlier in the night, they had to make it family friendly, so they had to cut out curse words and change song lyrics. There was also the scene where they changed an entire song, so that Carly Rae Jepsen would have her own song. But I did actually like the song change. I just wasn't really expecting it.
Overall I really liked both films. I think they did a really good job capturing the 50's time zone, but making so it's still interesting for younger people.
Karl Friedrich Lippman - Mother and Child (1920)
Kathe Kollwitz - Death and Tragedy (1925)
