Something of note is that many areas won by Reagan in 1980 all had very thin levels of support for him over Carter.
In the below map, this is a scenario where Reagan wins the NPV while losing the EC.
In the below map, this is a scenario where Reagan wins the NPV by about the same margin that the pundits expected.
In the below map, this is a scenario where Carter wins the NPV by about the same margin that Reagan won the NPV in real life.
In the below map, this is a scenario where Reagan still outperforms expectations, yet slightly less so than in real life.