Spoilers - I liked the show, but
…the three things that bugged me during the season were:
1. Jude's death. Maybe this was going to be explored more (perhaps as a murder) if they had another season.
2. Celine's vision of God in the loo.
3. The parting of the Thames in the last episode.
I know this is a quirky show and there were a lot of things that needed to be taken with a grain of salt, but these three items seemed way over the top (for me).
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If vampires hate "plus signs" - imagine how they feel about the "square root" symbol.