Me too. First follow from external website to previously unvisited tweet, there's an error. If I open it again it works, and keeps working from then on. Also happening 100% of the time on new tweets.
Kinda funny that twitter can't figure out such basics such as opening a page correctly when following a link. This has been happening for months.
Loading a tweet really isn't that hard; it's just Twitter's engineering team is incompetent. Even tiny little websites that custom-roll their own forums have less trouble loading their content than Twitter.