If a scene transitions from INT. to EXT. or visa-versa, you should have a new scene heading:
EXT. BACKYARD – NIGHT
Masks pulled down, they insert the pick into the lock. They turn the torque wrench and enter...
INT. LAUNDRY ROOM – CONTINUOUS
If a scene breaks between INT. and EXT., you should include both in the scene heading:
INT./EXT. DANI’S BEDROOM – NIGHT
Steven pelts another rock at her window. She relents, and opens it.
My dad will hear you!
Scenes that take place in cars are often in this territory, unless we are strictly inside or outside the car.