On the whole I try to stay out of the temperature series debates because on the whole that are pretty darn impressive. Having an error in the ballpark of +/-0.25 C for a whole planet is a remarkable accomplishment. The are still blemishes, but they require squinting which now has become completely over done with the Pause debate and the new Cowtan and Way kriging into the stratosphere method.
While all this is going on the most obvious blemish is completely swept under the rug, the Southern Hemisphere divergence.
The data for the Antarctic didn't really start until the late 1950s. The coldest place on the planet has the least data for a good reason, it is the coldest place on the planet. Even though the Antarctic is only around 4% of the entire globe including sea ice extent, it has been a battle ground for sneaking in a tiny bit of "global" warming for good measure. Sometimes tweaking can get a bit out of hand.
As I said, the difference is not much to write home about, but since everybody and their brother trying to boost trends in their favor, I just had to toss this out as one of those flat forehead moments. The data has an uncertainty range for a reason gang.