USA Flag on Blue Jays?

It was the same for all MLB teams, not only the Blue Jays.

When on the right sleeve, the U.S. Military also has the flag facing that way.

Only the flag patches affixed to right shoulders of uniforms are reversed, so the blue field of stars faces forward. (Left shoulder patches aren't a problem, as the stars face forward without meddling.) The reversal was inspired by the age-old practice of carrying flags into battle. When fastened to a standard, the American flag's blue-and-white portion is always closest to the pole. A flag bearer rushing into the fray, then, would naturally lead with the stars. In fact, it would be virtually impossible to lead with the stripes-the flag would simply wilt and wrap around the pole, rather than waving triumphantly in the wind.

For a service man or women to lead with shoulder-borne stripes, then, might smack of cowardice and retreat, as if the totters were backpedaling away from the conflict. The official Army guidelines on the donning of flag patches add that the forward-facing stars give "the effect of the flag flying in the breeze as the wearer moves forward.” So perhaps it's best to think of every military person as a latter-day flag bearer, leading the headlong charge into battle.

It was not backwards. When the flag is displayed on a sleeve it is displayed with the blue part to the front of the body.

So, if it is on a right sleeve the blue (also known as the "canon") section would appear to be on the right side of the flag, while if it is on a left sleeve the canon would appear to the left side.

Same thing goes for flag decals on vehicles - the blue goes towards the front of the vehicle.

Now, had that flag on their sleeves been on a flat surface like a wall or hanging from a railing, you are correct - it would be backwards.