Pete's dad (Albert Brooks) mentions his mom wanted to get an abortion - because "it was the 70's". Pete becoming 40 would indicate he would have been born in 1972. Roe V. Wade was not passed until January 1973.
When Debbie is having lunch with her dad, Oliver, he pulls out his iPhone and it's clearly showing the dock connector on the top, and the phone would be upside down. After Debbie picks the phone up, it is the correct way when she is flipping through pictures.
Oliver uses his iPhone upside down. When he shows Debbie a picture on it, the speakers are visible from the top. When Oliver excuses himself and Debbie picks up phone, the headphone jack and power button are visible from the top instead.