For a developer from overseas, another skill valued by US interviewers is wit.
A lot of US interviewers really appreciate it. Many believe it shows an intelligent communicator, who gets things fast. Humor and wit doesn’t always cross borders. Takes a long time to learn the American way, though many US interviewers aren’t American.
If you delight your interviewer with just a little bit of ingenious humor and wit, it will be memorable and outstanding. Most of the time candidate’s wit isn’t ingenious, but some effort is worthwhile.
In US everyday culture, humor is prized more than in other cultures. There is a less hierarchical, more free-flowing, expressive, almost “selling” style.
You mentioned some colleague spending a lot of his personal time getting familiar with fantasy football? Same kind of thing.