I just started watching the TV series... I'm up to episode 4

I need some help because some of the storyline has been changed from the OVA to the TV like Parn never met Orson or Shiris, which he had done so already on the OVA...

It also seems that they have never fought Shooting Star and Wagnar is still alive...


I was just wandering if those assumptions are true... and if you could also give me other storyline changes from the OVA to the TV series so that I can understand the TV series better without getting confused with the OVA...

Thanks...