That hind leg... .... ... this frame wasn't meant to be looked at individually but still.

This galloping frame is funny. While it does come from one, it doesn't look like one.

I wonder what she is looking at?

Higher quality version here: post #472

That rope is kind of funny. Gravity is supposed to pull that lantern down so you do not get that nice effect of the rope dropping down. However, this is most likely breaking the rules artistically to get that exact effect of having rope droop down like that.

And another instance of MLP:FiM breaking their own rules: filly eyes are typically perfectly circular. However, both the eye and the iris are vertically stretched to exaggerate her expression.

Griffon statues are in profile while the library is viewed at an angle. If you were to theoretically look at the library door head-on, then the griffons are not facing frontward. There would have been symmetry which would be totally fine and good for architecture but the direction these statues are facing makes this some pretty bad architectural design once you actually stop and look at this screencap.

I am certain the design on the inner walls are not supposed to be cut off.

Geez, some of the animators have been really slipping. Some of the books are done in a different style which creates a needless level of fakeness. Some of the books have a noticably darker outline for their fill color, and their outline weight is variable. The art style uses outlines a little darker than the fill color for some objects and characters. Outlines are also a consistent length unless an outline is being tapered to suggest that one shape is merging into another.

Just give this a moment and think about how long pinkie's spine normally is. Look at how unusually short her spine is in this particular screencap.

Be aware that horses cannot bend their leg above their spine. This particular leg was probably extra flexible to help exaggerate this bucking motion. Cutie mark is also upside-down.

Sweetie belle keeps a lot of toys in her bedroom.

Refer to post #434 for a more zoomed-out version.

If anyone really wants to trace this, be aware that Twilight is there - she's just a speck in the center of the composition. Refer to post post #435 for a more zoomed-in version

I am almost certain a bit of stretch and squash was applied to help Applebloom reach the blinds thing.