The episode starts off with Sentai Doomtron footage.
Here's some shots of the Rangers by the Megazord in Jet Mode
  This is actually edited footage. The zord and the Bay would be Sentai footage however they added the American actors into the shot.
Here's a shot of Jen and Lucas in the Megazord cockpit
After the opening credits, you'll see a Sentai Doomtron shot. However I believe the following footage of the Red Ranger fighting off C-bots is new.
However all Doomtron cockpit shots, all of those are Sentai footage.
After Frax orders to finish him (Wes) off, it then goes back to Sentai C-bot footage.
I'm not sure of the Red Ranger's reaction to Jet Mode's arrival (could be Sentai, could be new but I don't know) however the following shot is indeed Sentai footage.
Once you see the Red Ranger in front of C-bots then it's back to new footage.However it then cuts back to Sentai footage of the other 4 Rangers.
This shot appears to be new footage and that is indeed when it goes back to new footage.
Once you see the downed Doomtron then that is when it goes back to Sentai footage.
Here's the Frozen Gluto
It then cuts back to more Sentai footage due to Doomtron still being down.
The display shot that you see as Trip is adjusting the Quantum Defender is a Sentai display. The quick shot of Q-Rex also appears to be Sentai but I can't be 100% sure on that since it was just a case of them throwing in some recycled shot.
Once you see the feet (or rather foot) of Doomtron as seen here then that is when it goes back to Sentai footage.
It then cuts to the American actors. However you'll then see a cut back to Doomtron in Sentai footage.
It then cuts back to the American actors so that the 5 of them could morph.
Here's a shot of the 5 Rangers but this time Wes has the Quantum Defender
While Red calls for the Q-Rex in new footage, it then cuts to the Sentai footage of the Q-Rex.
Jen calls for the Megazord in new footage however it then cuts to the Sentai footage of the Megazord in Jet Mode which is actually when it goes back to Sentai footage.
This shot of Frax is when it goes back to new footage.
There's a Sentai up-close shot of Frax's face opening up as well as his arm (the one that usually changes its Hand to Missiles) going limp (or is it limb? I'm not sure of the word.) Anyway there is also the Sentai close-up of Frax's face falling apart as well as the following full shot of the dead Frax however it then cuts back to Nadira and Ransik.
Here's a side shot of the 5 Rangers with their Chrono Sabers
Here's a shot of the Red Battle Warrior (or the Red Battle Fire Ranger or whatever the name is)
Here's a shot of the Time Ship on the beach with a bunch of other people on the beach due to Trip, Jen, Lucas, Katie, Wes, Eric, Mr. Collins and the Silver Guardians being there. This shot of the Time Ship is actually new.
I'm not sure of the shots of the Time Ship as the time stream beam causes the humans from the future to disappear however the Time Ship shot is likely new footage even though it looks like Sentai footage.

Sentai footage comes from Time Episode 50