The exterior shot of Pulp Fiction's fictional Jack Rabbit Slim's restaurant was filmed near the Grand Central Air Terminal at Flower and Sonora. We passed right by it on the Glendale History Ride!
Check out all of the info and pictures of Jack Rabbit Slim's at I Am Not A Stalker. The building was part of a 60-lane bowling alley, and is now owned by Disney as part of the Grand Central Creative Complex.
I Am Not A Stalker has tons more info on local filming locations, including Lance's House from Pulp Fiction, which is just across the tracks in Atwater Village.