When Zoltar is first seen, seated at a console and laughing hysterically, he is wearing a brown tunic under his cape, which turns to the usual blue color as he stands up and leaves.
7-Zark-7 says he's never met any of the members of G-Force in person. Princess was previously seen visiting him in the control center in Ace from Outer Space (1978) and again, together with Mark, in Fearful Sea Anemone (1978). However, as this series was shown in syndication the episodes could be shown in any order.
After the Phoenix returns to normal from it's fire form, the members of G-Force are shown in the cockpit from behind. One half of Tiny's cape is colored blue instead of green.
Jason refers to the TBX Missiles as "TBS Missiles" at one point, owing to it being misspelled in the script.