The onscreen caption before the attack at the French garage gives the date as "August 14th 1977" but the mocked-up front page of the Guardian on Steed's table - seen as he phones Emma to check that she had heard about the attack - gives the date as "Tuesday April 3".
After the Russian attack on the first chateau the French captain says they are heading south. Moments later the next attack is 8km north.
The French captain says the first chateau attacked was allied HQ during WW2. At the 2nd chateaux he says that the 2nd chateau was Allied HQ during WW2.
In the 1965 scenes at the beginning you can see 1970's cars in the back ground (when the soldier leaps the fence)
The Russians, supposedly planted in the 1940s, were to be revived by satellite radio signals. Yet there were no satellites at the time; the first Russian satellite launched was Sputnik in 1957, at least a decade later. Its technology could not have been anticipated, still less the technology of a satellite from the 1970s.