While the Sesame Street DVDs contain enough warnings to ward you off ever letting your child watch them (apparently we're all brain dead retards for watching them in the 70s) it DIDN'T stop me buying some "old school" episodes on DVD for Emily.
While on holiday I put an episode on featuring the song "Exit" by Little Chrissy and the Alphabeats. It may be from 1974, but it didn't stop Emily dancing and singing along.
If that's what the warning was all about, I fully embrace ignoring it because Emily just loves that song, as well as all the other letters and numbers the episode are brought to you by.