Subfamily

Ok... I have lots of excuses... I'd been working 70 hours a week for a month... it was 6 am... it was foggy... it was dark and my flashlight batteries were dead... my jumper cable red and black are too close... but the bottom line is I messed up. I have a 1996 Subaru Outback that had the dome light left on for days, and therefore a very low battery. My wife has a 2000 Subura Legacy Sedan. I thought I had been very careful, but I hooked the cables up backwards. The Outback's power was totally shut down. I was dumb enough to start her car. When this did not make a difference, I got out and happened to touch the jumper cable, which was very hot. I knew instantly and confirmed my error. I pulled them off and inspected batteries, fuses, wires, etc. for damage. Everything looked okay. I hooked the cables back up and jump-started the Outback. Both cars have been working fine for over a week... batteries have been charging and holding a charge even in very cold weather... all electronics are still working. I am still very afraid of the damage I may have caused. Is there any safety feature that Subaru puts in place to prevent stupidity and protect the electronics? If not, what possible damage might have been done and how should I check for it?