Surely this counts as correct

not much, BUT WHAT IS GOING ON DOWN IN NORWAY

This one's worse.

-_- why duolingo why

its duolingo what do you expect

true

That is a legitimate mistake. German must be very precise.

Difference: a/the before bicycle

No, not really. Your answer would be something like: Er fährt der Fahrrad im Wald, er mag die Straßen nicht. The problem with your answer lies in the "der Fahrrad" You don't need the article in that situation, unless you want to say "the bike" instead of "a bike".

You had one job.

Also the options are lined up perfectly,