Jason Reitman’s “Saturday Night” is a great look at the first year of “Saturday Night Live.” But “SNL50 ... takes a deep dive into a Will Ferrell sketch that hung around for years.

Presenting the sketch chosen to represent Season 21: "Get Off the Shed: Birthday Party” starring Host Christine Baranski ...

Instead of chronicling the “eras” (hasn’t that already been done?), the Peacock documentary plucks out concepts and lets you see how the sausage is made.