The lunar liftoff was filmed from the Rover's onboard, remote controlled (from an operator at Houston) TV camera. No "film" was involved. The delay in the image sent from the Moon was a couple/few seconds, not minutes. The operator timed the upward pan by estimating the launch moment, minus the delay, and start panning. He got it right on A17, after not getting it on the A15 and 16 departures.
The "flame" you see on the A17 ascent stage liftoff is a combination of initial combustion instabilities and the glowing bits of material (insulation, etc) from the "launchpad", the expended descent stage. Notice that once clear of the lower stage, the "flame" is gone, only the glow from the actual combustion chamber is visible. The hypergolic fuels used don't show noticable flame in a vaccuum when burning in a steady state.
edit: and absolute zero is around -459F, -273C...the lunar surface gets nowhere near that cold.