Misc: In which film does Robert De Niro ask "Are you talkin' to me"?

Questions

what company did the taxi gang work for?

what cousin appeared in the last season making "the brady bunch" more annoying?

what two "happy days" spinoffs have "and" in their titles (format: 1, 2)?

what was the name of the robot agent in "get smart"?

who played schneider, the handyman, on "one day at a time"?