When the Green Hornet turns on the television set, we see a quick shot of Batman and Robin climbing the exterior of a building. Batman (1966) and "The Green Hornet" were filmed by the same production company/studio and both series aired on ABC during the 1966-67 season.
The original air date for this episode is disputed. The very same sources that place The Hornet and the Firefly (1967) to December 30, 1966 instead of March 24, 1967 (with December 30 skipped) also switch this with the previous week's Bad Bet on a 459-Silent (1967).
After Mike Axford is shot, the meeting ends, and rescheduled for the next evening, using the phrase, "Same time, Same place". This connects to the Batman series ending.
This episode marks the only time we see any part of the upper floor of Britt Reid's home. He is on the second storey when he spies on Gant and his goon sneaking into the living room (when the two men spot Axford on the living room TV).