FAQ for
The Goonies (1985) More at IMDbPro »

The DVD contains a commentary with director and cast, deleted scenes (including the octopus), a music video and a documentary.

Sean Astin had to leave halfway through recording DVD commentary for "The Goonies" because the recording session started late, and Sean had an earlier commitment to introduce friend Joe Pantoliano at a local theatre. He left the recording studio to change his clothes, then returned to apologize and explain why he had to leave. Sean gave a "shout out to Joey Pants," and jokingly left an action figure of Samwise Gamgee (his character from the "Lord of the Rings" films) at his seat to take his place.

However, Sean's departure and explanation were edited out of the finished product by the DVD producers for reasons unknown, making it look like Astin simply vanished from the studio.

There are conflicting reports.

http://www.reelzchannel.com/movie-news/781/brolin-indicates-goonies-2-unlikely

http://www.youtube.com/watch?v=I-pBtmcByjc

There have been two video game spin-offs: The Goonies (1985) and The Goonies II (1985).

Yes. Note that the DVD box and the special features menu incorrectly label the deleted scenes as outtakes.