The ep starts off with an American shot of the city however once you see the 2 female Rangers fighting Ironspike then that is when it goes to Sentai footage.
This shot is when it goes back to new footage.
This shot is when I'm sure of when it goes back to Sentai footage.
Here's Sentai footage of Ironspike
All of Ironspike's footage is Sentai footage. The Giant footage involving him has been removed.
Here's new footage of the Rangers fighting Artillicon
This shot of the Red Ranger in midair is when it goes back to Sentai footage.
This shot of the downed Rangers is when it goes back to new footage.
After Katie leaves the Newspaper Office in order to buy some lunch, the following shot is when it goes back to new footage which includes the shots of Artillicon in his "Fly Mode." Unfortuantely I was unable to get a good shot of him in his Fly Mode.
Here's new footage of Artillicon
After Red presses a button on his Morpher and calls for the Vortex Blaster, it then cuts into the Sentai stock sequence of the Vortex Blaster coming together. After Red says "Lock on," it then cuts back into new footage of Artillicon. It then cuts back into the Sentai stock sequence of the Red Ranger as he orders "Fire!" and they fire the Vortex Blaster. It then cuts into new footage of the blast hitting Artillicon.
Here's another new shot of Artillicon
After Mitch enters into the elevator and the door to it closes, it then cuts outside to new footage of Artillicon which includes a shot of him firing on the Newspaper Building.
After Katie saves Mitch from a big fall in the elevator, she then leaves and while outside, she morphs. It goes back into Sentai footage as soon as you see the Blue Ranger.
All of the Giant footage is Sentai footage.

Footage comes from Time Episode 8