Despicable Me: Shrink Ray

Let us watch the following video and dissect the science of the shrink ray.

The Shrinking:

Let me begin with some background.  Everything we can "touch" is matter.  In this clip, Gru is matter, the minions are matter, the ship is matter, the air is matter, Vector is matter, the shrink ray is matter, the clouds are matter, Gru's scarf is matter... I think you get the point.  And matter is made up of atoms.  And atoms maintain a certain size.  For all intents and purposes, we can assume that an oxygen atom will be the same size as all other oxygen atoms.  Therefore, atoms cannot "shrink" in size.

This leads me to assume that if something were to shrink, then it would contain less atoms.  Therefore, the post-shrunk object has fewer atoms than the pre-shrunk object.  But we don't see any atoms.  Do they just go away?  Disappear?  Bleep out of existence?  Not possible.  This would violate the law of the conservation of mass.  If you don't know what mass is, think of it as (I'm colossally simplifying the idea) mass is a how much of you there is (e.g. you weigh 120 lbs, so your mass is 54 kg).  So, the law of conservation of mass just means that what goes in, must come out.  So, if we have x many atoms before shrinking, then we should still have x many atoms after shrinking.  Which leads to the following example.

Let's say we hit a minion with some shrink rays.  This minion should then become a mini minion and some spare atoms.

atoms not accurately portrayed

We can use this for any shrunk object:

shrink rays + object = spare atoms + mini object

where,

object atoms = spare atoms + mini atoms.

So, where are our missing atoms?  Well, apparently, they are not far.  If you have seen the movie, then you know that the shrunk objects don't stay shrunk for long.  They just pop right back to the normal size...........  I have no idea how this happens.

Now, I'm going to back track a bit to pose the following question:  If the atoms could shrink, is the mass the same?  If it is, I would assume that the gravitational pull is the same.  Gravitational pull is what causes things to fall to earth.

Now, in the movie Gru shrinks the moon.  The moon's gravitational pull is strong enough to cause tides, the rising and lowering of the ocean water, on earth.  And if your standing on the moon, you stay on the moon.  You don't go flying off into space or tumbling back to earth.  In short, the moon has a noticeable gravitational pull  The moon's mass is 70,000,000,000,000,000,000,000 kg.  That's 1,000,000,000,000,000,000,000 150 lbs people, reduced to the size of a baseball.  Yikes. So, I'm wondering how he manages to capture it and carry it around with him.  I have no answer for this.

Some things to think about:

In the video, the shrink ray shrinks the plane.  But the plane isn't one thing.  It shrinks the metal plates, the rivets, the glass, the electronics, etc. but it doesn't shrink Gru and the minions.  So, how does the shrink ray select what it shrinks?

What are the shrink rays made of?  How does it induce shrinking?  Is it a chemical reaction?

Any other scientific inconsistencies with the shrink ray?