It has Batman, Robin and Riddler in it. It's a live-action adaptation of Superfriends within the 1966 continuity as far as I'm concerned.
Might be a reach, but technically each chronobowl is set at different points in time. Perhaps they are the same universe and Jay has just split off from the 1950s setting? Also, The Flash movie dealt with Earth-1 and Earth-89 being melded together, so maybe some universes had elements temporally split off from one other.
Honestly, the only major DC shows in that 1950s to 1970s period with barely any evidence of being linked is Shazam and Isis. It would have been cool if the young Billy Batson in Batman '66's final issue was a younger version of the 1974 TV series version who eventually joined the Justice League with a recast face.