No, because the TV Guide in my area included three different channels for each network, so while there some shows that never aired where I lived (CBS's Spin-Off and, for many years from 1978 through 1990, TPIR; NBC's 50 Grand Slam and Just Men), I knew about them. I also knew about a couple of syndicated shows that never aired here (Dawson Masquerade Party, and Barry Break the Bank) through TV Guide's Fall Preview issues, although MP was also mentioned once on an episode of The Odd Couple where Dawson made an appearance.
Syndicated shows, on the other hand...I thought nighttime TPIR and Narz Concentration (which only aired on Wednesday nights) had been canceled after two seasons. (It was part of a strip of five, and when two of the other three - Dealer's Choice and The New Treasure Hunt - were canceled after two seasons, and Name That Tune moved to another channel, the station dropped these two and nobody picked them back up.) I do remember once in the late 1970s when I was watching a different syndicated show and could barely hear Any Number being played in the background audio for some strange reason.