There are a lot of things (really too many to list), so I'll nail down a few that weren't mentioned.
Non-WoW orcs. I like my porcine humanoids to not be green skinned strong humans. Also never understood how a half orc was usually taller than either parent.
Non-FR elves. Prior to 5E, elves averaged about 5 feet tall... except in the Realms where they're as tall as humans. Now all elves are assumed to be FR elves, making the Valley Elves much less special.
Non-tinker gnomes. Seriously, the only thing worse from Dragonlance was kender...
The mnemonic component of spellcasting. It's still there, with both prepared and known spells, but it's very much glossed over.
Racism, by which I mean how the races didn't like each other. For example, elves and dwarves really didn't like or trust each other... at all. Look at Gimili and the other dwarves during the Council of Elrond in Fellowship of the Ring (specifically "never trust an elf!"). The fact that he and Legolas eventually formed a bond was supposed to be an amazing exception to the norm. Now, dwarf and elf PCs are always buddy-buddy, and have no problem with the half-orc who's ancestor probably killed the elf's grandfather. This is almost certainly going to be an unpopular opinion, but I don't care.
Non-WoW orcs. I like my porcine humanoids to not be green skinned strong humans. Also never understood how a half orc was usually taller than either parent.
Non-FR elves. Prior to 5E, elves averaged about 5 feet tall... except in the Realms where they're as tall as humans. Now all elves are assumed to be FR elves, making the Valley Elves much less special.
Non-tinker gnomes. Seriously, the only thing worse from Dragonlance was kender...
The mnemonic component of spellcasting. It's still there, with both prepared and known spells, but it's very much glossed over.
Racism, by which I mean how the races didn't like each other. For example, elves and dwarves really didn't like or trust each other... at all. Look at Gimili and the other dwarves during the Council of Elrond in Fellowship of the Ring (specifically "never trust an elf!"). The fact that he and Legolas eventually formed a bond was supposed to be an amazing exception to the norm. Now, dwarf and elf PCs are always buddy-buddy, and have no problem with the half-orc who's ancestor probably killed the elf's grandfather. This is almost certainly going to be an unpopular opinion, but I don't care.