Misc: Which country joined WWII as an ally of Nazi Germany?

Questions

waiter for mia and vincent is what singer?

What brand of car does Mr. Wolf drive?

"The Leap Home, Pt 2", takes place during this war, where Sam's brother dies.?

In "Play It Again, Seymour", Sam's Leapee is the spitting image of this actor.?

Sam Leaped into a woman for the first time in this episode.?