Jan and I have [some things / something] in common.
First, we like Sailormoon
Second, we like cats
Third, we have long hair

I think some things is the right choice,
because I have listed three things that both Jan and I have,
but "have something in common" is here:

Does this mean that I am wrong if I pick some things?

  • In dictionary definitions/patterns, something is usually a placeholder for a noun phrase.
    – user3395
    May 22 '17 at 17:32
  • 3
    With a list (the things) I would use "some things", though something is not specific regarding plurality.
    – user3169
    May 22 '17 at 17:47
  • 3
    Here, "some things" is fine. When we say that we have "something in common" with another person it is usually one thing. I have something in common with Jan. We both grew up near the ocean. It there are several things, we'd probably say I have a few things in common with Jan. We both grew up near the ocean. We both had a pet dog. And we both are good at math. May 22 '17 at 17:57

If you say

We have some things in common

people may expect a list of those things

but if you say

We have something in common

there is more an air of mystery about what it is that is common

There's something about her, but I just can't put my finger on it.

which may mean there are attributes about her which taken together are attractive but escape articulation, there is more a sense of mystery.

If you say

Something's in the air tonight

it may be the weather, or the mood, or the music, usually positive, but if you say

Some things are in the air tonight

it may be understood to mean bugs, smoke, or air pollution, probably negative.

I think in your example

some things

is perfectly acceptable since they are enumerated, just as you might say

We have a few things in common.
... list...

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