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I wouldn't worry about the cracked adjustable lifter - was probably done during installation when they set the lash.
Your block wasn't "drilled" for adjustable lifters (to put a rod through to hold them as the tappet wrench is used), to they probably used those goofy Thompson tools that go into the holes at the top (to hold the lifter). My guess is that they chipped the top during that whole lash setting process. I'd not worry about it in the least.
On the lifter bore - does look like a crack, hard to tell. I'm not worried about the crack as it is, but over time it may progress downward toward the center of the block. I'd inspect it closely - under magnification. If the engine was apart, I'd mag it and if needed, I'd drill the end of the crack to keep it from growing. This is not really something you can do when the engine is together.
Best of luck!
B&S