Although she isn't shown driving it until her twelfth episode (Cruising Angels (1979)), Sabrina's orange Pinto - seen parked outside the Townsend Agency building - was indeed used by her replacement, Tiffany Welles. You'd think after three years the company could afford a nicer - and less conspicuous - car. Perhaps the fault lies with the notoriously stingy Bosley.
Julia's fingernails are painted a brown color but on the close-up of the box with Rita's earring that she is supposedly holding, the fingernails are not painted.
The million dollar ransom would weigh at least 17 pounds (if in $100 bills) but the backpack is picked up by different people in the episode as if it is weightless.
Rita has just been rather violently rescued---involving guns and physical fights happening in front of her---and suffered tremendous mental and emotional trauma, affecting the physical. She probably was also drugged and/or sleep (and food) deprived. Yet, she immediately goes out in the skating rink, and flawlessly performs a routine that she hasn't rehearsed for weeks.