Your deadlift doesn't look like the one in the book. Your squat doesn't look like the one on YouTube. That doesn't mean you're doing it wrong.
Starting Strength Coach Grant Broggi breaks down how different body types change what Starting Strength looks like: long femurs, short torsos, tall lifters, short lifters. He explains why the lifts look different from person to person, why the principles stay the same, and how to check your own position against what matters instead of against someone else's video.