Debra Morgan drives an E46 BMW convertible. The crashed car that we can see later is an E36 BMW, the predecessor of an E46.
When Deb is waiting outside of LaGuerta's House (at around 19 mins), you can see that her BMW model is a 2003. When Dexter goes to the garage to check Deb's car after the accident, the BMW is from 1998.
When Dexter hands Deb the pen that was used to poison Sal, he said to test the pen for aconitine and Hannah's prints. However, Hannah herself had said in a previous episode that she used a different untraceable toxin for Sal and the double toxscreen showed just that.
When Dexter and Hannah are talking about the counselor getting poisoned, they say it's in his coffee but in the previous episode it said it was in his food.