Earth-16 Oliver Queen's cybernetic arm has a Star Labs logo on it meaning it was created by them for him.
At the end of the episode, on a back shelf in Rip Hunter's office, you can see a metal pot with eye holes in it. This is the helmet of "Ma Hunkel" the original Red Tornado!
Earth-16 Oliver Queen states that the equipment the team is looking for is at 'Adams and O'Neil's. These were the authors of the classic DC comic series of Green Lantern and Green Arrow of late 60s to early 70s.
Arrow's season 5 suit can be seen in this episode, even though season 4 of the show was airing at the time of this episode coming out. Meaning they had planned to change it anyway.