"The kids have all seen it on DVD or videotape"

This quote by Frankie Avalon is likely referring to a film or television reveal that has been released on DVD or video. It is most likely that the kids he is describing have actually seen the motion picture or show, either by leasing or buying the DVD or video, or by obtaining it from a good friend or relative. This quote suggests that the movie or show is popular amongst kids, which it is extensively available for them to see. It might likewise be interpreted as a talk about the altering media landscape, as DVDs and videotapes have actually become less popular in the last few years due to the rise of streaming services. This quote is a tip that, while streaming services are practical, physical media such as DVDs and videos are still commonly available and popular among kids.