In the picnic/runaway baby stroller scene, Tommy is still wearing Green and Billy is wearing his old eyeglasses from season 1. This was due to the fact Jason David Frank and David Yost had to match the stock footage.
Baby Jacob Anderson is played by Jacob Frank, who is Jason David Frank's son from his first marriage.
The first part of this three-parter is the first episode in the show's history not to use any Super Sentai footage, as well as the first episode in which none of the Rangers ever appear morphed.
When tommy is about to teleport to the command center his hair is down and you can see him tying it up. This is to match the stock footage for the command center scene. Which has old stock footage of Jason, zack, and trini you can tell by Zack hair being either beginning season 2 or somewhere middle of season 1.