The base set took me a while to format, then put in properly because cards #1-100 are dual player cards, which takes more work to properly link to each player. And, like mentioned before, some of these sets aren't always consistent with their SNs or even the presence of a card in each parallel. For example the Living Legends subset has 5 parallels with consistent checklists and SNs throughout. But it also has 2 more auto parallels where the checklists are ever so slightly different and the SNs can vary if they didn't get enough autographs from one or two players to give everyone 15 cards of whatever.
I was planning on adding the parallels when I get time, but it can be a bit of a process tracking down the correct information and double checking the details.