Solution:

Coffee.

The person with two a's drink coffee.
The person with two e's drink coke.
By the same logic, Armando drinks coffee.

Solution:

Eye

Solution:

The man has 6 fingers in each hand. This is a mind diversion riddle where the focus of the reader is on red dots

Solution:

There are 14 3's in the dialer screen.

Solution:

The coin in the 1st bucket. At 25 degrees C water is liquid, while at 25 degrees F it turns into ice.

Solution:

Door number-1.

The Symbols on the doors are actually number + mirror images of the number.

Solution:

Beauty.
Because beauty is in the eye of the beholder.

Solution:

The first man is the assassin as he is coming from below.

Solution:

The lady in the red.
She spends lots of money on food which is much more than a one-person need.

Solution:

The Waiter

Holding a tray is a static job while serving dishes and drinks is their main work and hence the waiter is most likely the left-handed person.

Solution:

The river was frozen.

Solution:

19

Solution:

He is on top of two rocks. Snipper's gun head can be shown.

Solution:

MOB + I(pointing to me) + Le (Bruce Lee) = MOBILE.

Solution:

It can be done as shown below.

Solution:

The Order of stupidity in decreasing order(most stupid to least) is 4,1,2 and 3.

Explanation:
Cutting his own trunk so Guy-4 is most stupid.
Next is Guy-1 as he is gagging on a tree that is to be cut down by guy-2.
Next is Guy-2 as he is not considering him to go down.
Guy-3 is a bad person but not a stupid one.

Solution:

I am a mobile phone.

Solution:

If You can read this you are awesome.

Solution:

19.

The numbers are marked in the picture below,

Solution:

The hidden cat is marked in the picture below.