So, I'm not sure that the American's would actually celebrate Hitler's birthday directly. The US is in this weird spot where it is part of the Germanic Empire but not part of the Reich proper. There might be parties and things held by some German-American organizations, and probably galas in Omaha at the Imperial Embassy and elsewhere, but maybe it isn't a formal official holiday.
Thanksgiving definitely continues, albeit through a new lens for sure.
I also think that southern states would likely put greater glory and emphasis on the Confederacy, but I don't think you would see this be projected outside that region too much. Maybe Lee and Stonewall Jackson get rehabilitated into national heroes to some extent. There's going to be a dance between glorifying the racist elements of the Confederacy while simultaneously downplaying the fact that they did rebel against the Federal Government.
Currency....
$1 = Washington
$2 = Jefferson
$5 = ... Lincoln would be dropped I think. Calhoun might be here?
$10 = Hamilton?
$20 = Jackson (for sure)
$50 = Grant....hmm. Maybe replaced by Lee?
$100 = Franklin...maybe. He'd been on there for quite some time by that point.
$500 = went out of print in the 1940s, recalled in the 1960s, Had William McKinnley. I see these getting reissued as inflation skyrockets and there is a greater need for higher denominations. Maybe this is where Lucky Lindy goes?
Coins:
1¢ = Drop Lincoln. Either return to the Indian Head Cent, or an American Eagle
5¢ = Jefferson?
10¢ = Goddess of Liberty?
25¢ = Washington
50¢ = "Walking Liberty" was the last design from OTL (after that was Franklin, then Kennedy).
1$ = Morgan/Peace designs.
The more I think about it, I could see the coins all going to new designs to support concepts of the state, so instead of having any former Leaders on it (save maybe Washington on the Quarter..that tradition goes back a long ways), the coins have symbols like the eagle, the torch, etc.
As for restaurants...
- I could see places near German bases having a chain of German food restaurants taking off and being regionally successful.
- In California, where the Japanese have a stronger presence, I could see certain Japanese eateries taking off.