I don't see any trick ones, but I've been doing this for 30 years. There's no synthetic programming or anything that's not in the manual. Do read the manual from cover to cover. HP did a marvelous job of writing the manuals, such that you can just read through, and when you get to the end, you know the machine, without ever having gotten to the hard part—because there was no hard part.
In program mode, you can single-step through the program with SST (and backstep with BST) and see if what you see in the display at each step matches the listing you copied it from. If there's a difference, press the back arrow to get rid of the instruction you're seeing and try again to key in the right one. The new instruction will be inserted where you are in the sequence. If you make a mistake again, you can repeat the process and try as many times as it takes to get it right. dlachieze addressed several of the instruction that are beyond the simplest.