Note: a photo is worth a thousand words.
Several credit changes mark the beginning of season 3; Rupert Holmes is now listed as series creator and also as co-producer starting with episode 3; Howard Meltzer shares executive producer credit with Paula Connelly Skorka (the series production company is now also listed as Howard Meltzer Productions, Inc.). Thomas DeWolfe is listed as the supervising producer. C.J. Byrnes has also been shifted from a guest cast credit to the regular closing cast list.
When is WENN?: Mr. Eldridge mentions the sinking of the British ship Hood by the German battleship Bismarck, which dates this episode as on or after May 24, 1941.
When is WENN?: In Is Something Burning? Mackie mentions the day as being the anniversary of the start of the War of 1812, which puts the date at June 1, 1941. (The title of the show is also probably meant as an inside joke, as it was in the War of 1812 that the British burnt the White House.)
When is WENN?: This episode is dated July 27, 1941.
When is WENN?: This episode takes place August 12-13, 1941.
When is WENN?: This episode takes place August 1941.