The Soviet Union collapsing in 1979 means Carter probably wins a second term—Ronnie Raygun doesn't have a Communist bogeyman to rally against (I know that wasn't his only selling point). That leads to a *very* different 80s in so many ways. Far less specter of WW3, probably more Yuppyism, even without Reagan, due to the burgeoning economy; but the government isn't gutted by Republicans. Germany doesn't feel like it's at nuclear death's door for a decade (but they've got reunification blues).
No Iran-Contra. Less successful NNTN. Weaker, demoralized military (not a Democrat thing but just extended Vietnam; no clear enemy, no military-industrial complex buildup in the '80s). Probably no Rambo. Definitely no Red Dawn. But maybe more global shows with characters trotting everywhere but Mao's China.