Comment by bena

Being in a Marvel movie greatly increases your connectedness.

Samuel L. Jackson and Robert Downey Jr. are central to a lot of plotlines in the first 10 years of Marvel movies. With either them or characters connected to them appearing in other movies.

Then you have other franchise connections. If you've been in a Kevin Smith film, you're at most three steps from Samuel L. Jackson by way of Kevin Smith -> Bruce Willis -> Samuel L Jackson. And even if you're not in a film in the "View Askewniverse" like "Zac and Miri Make a Porno", that movie has Justin Long, who was in a movie with Willis.

Every actor in the Fast and Furious franchise is connected through Vin Diesel.

Every actor in the OT and sequel trilogy of Star Wars is connected through Harrison Ford. The prequel trilogy connects through Natalie Portman.

Just between those, it's not too hard to reach everyone.