The ball passes below the keeper's body, a ball that should be easily stopped, but instead, it gets in. This is very common in Indoor games, and does happen quite a lot on normal games too. They all use some sort of complicated rule base. You can read my article about it from a year ago, if you wish. Fifa 98 suffers from it.
Many games do.
So what happens is that the engine cheats. Actually, it usually does, in situations like that, it usually stops right after it crosses the goal line. There are lots of examples, not only in Fifa 98 but in most sports games out there. However, I should note that it doesn't happen ALL the time, but these occurrences are common enough to be noticed, and are especially annoying when they make you lose an important match. Still on topic, although not really OCC, I would like to mention the referees and the headers.