When J.D., Turk, Carla and Elliot are talking with each other in the cafeteria, J.D. is drinking a cup of juice and Elliot has a carton of milk. When J.D. is paged, the juice and the milk have switched places.
The hematopathologist writes his report with a pencil. Not only would he likely have dictated this sort of report and then have it transcribed and printed, but pencils are never used to document in medical records, since information could be erased and changed later.
Not only can't you read leukemia from an echocardiogram report, but the report that J.D. is reading is for a 66-year-old male named H L. Stockton; 6-ft. tall, 235 lbs., born Dec. 31, 1927. Also, the date of the procedure was Nov. 10, 1994, almost eight years prior to this air date.
Each time Ben takes a picture, it appears that a flash goes off. However, his camera is missing the flash attachment required for that model, and the resulting photos show no evidence of the more harsh front lighting and shadows that would be visible in a flash picture.
During the montage scene, when J.D. and Ben are sitting outside looking at Ben's photos, there is a boom mic in the very first picture, to the left of Dr. Cox.
Several mistakes when the hematopathologist is looking at the slide. The slide is made incorrectly. It appears that there is just a dried drop of blood in the center of the slide when it should take up half the slide and have a feathered edge in order to spread out the cells. It also is unstained (still red in color). Blood smears need to be Wright stained (which would give it a purple-ish color). He then places the slide unsecured onto the microscope stage. Finally, the microscope objective is placed much too high above the slide. He should be using a 50x or 100x oil objective, which would place it directly on top of the slide. As depicted, it would be impossible for the doctor to diagnose leukemia, let alone ID a single cell to make such a diagnosis.