When Axel tells his son Tom he has "something coming to him" in the bakery scene, there's an obvious substitution of a stunt double when Tom punches his dad -- that's not Ed Asner -- and he falls face down on the glass display. Note Axel was wearing button-braces on his pants, then it changes to clip-on suspenders when Axel is laying on his back.
Axel Jordache's suspenders change type after Tom knocks him into the display case.
On the evening of VE Day, they bring in an outhouse to burn on the fire, but it has a solid bottom.
Despite the opening credits indicating the major guest stars were listed in alphabetical order, Mike Evans and Gloria Grahame, are credited in reverse order.
The first episode is set in May, 1945. Several minutes in, Julie (Susan Blakely) is shown reading reading from a copy of Gone With The Wind to a soldier, but this particular edition wasn't published until the early 1970s by Avon Books.
At 7 minutes into the first episode, on the night of VE day in 1945, Julie is shown reading GONE WITH THE WIND to a dying soldier, back from WWII. The copy she is reading from is a mass-market paperback edition published by Avon Books in 1973 - there were no such paperback editions of GWTW available in 1945.
At the end of WWII in 1945, a Marine and a civilian engage in a fist fight. The Marine's Sergeant insignia has crossed rifles, which did not appear on Marine Corps enlisted insignia until 1958.