I am betting that the drop to 71 wasn't real...that it was a loss of contact artifact. Zoom in on that big drop and see if you spot a gray line anywhere which means loss of contact.
It happened too fast for it to be real. Oxygen levels don't drop suddenly like that and they don't go back up so fast either.
The other drop around 1:30.....dunno, it might be real but again zoom in on things to look for any gray lines.
An unremarkable pulse oximetery report doesn't necessarily mean no sleep apnea though. I have a friend who has OSA that was severe with 60 plus events per hour average and her oxygen levels never went below 94% from a baseline of 98%.
It's why I don't put all my eggs in the pulse ox basket for diagnosing or not diagnosing sleep apnea.
If you have other symptoms of sleep apnea....talk to your doctor.