I do have to question the pony lady refusing to give T/D their clue because they didn't arrive by the correct transportation? I don't think that was in the clue to refuse them (?) and wouldn't the normal way to handle it would have been to allow them to continue and give them the standard "wrong transportation" penalty at the mat?
I don't think we've ever gotten a complete explanation of the penalties on this show. We've seen teams (this season!) use improper transportation mid-leg and have a penalty assessed at the mat. We've seen teams screw up near the end and be told to go re-do the thing they screwed up before they can check in.

It would be interesting to know how long the Shetland Pony screw-up cost them. If it was more than 30 minutes I don't think that's fair. (not that it would've mattered ultimately)

Also, I continue to think that these tasks that are based on a local judge's subjective determination of whether the teams have "satisfactorily" completed the task are bullshit. It was clear to me that the Speed Bump judge was told to make the team do the dance twice and then wave them on.