Solution:

Bill. If you read the message upside down, you'll notice that the numbers resemble letters and that those letters form legible sentences. The message is 'Bill is boss. He sells oil.'

Solution:

The women is a of short stature. She can't reach the upper elevator buttons, but can push is with his umbrella.

Solution:

At that moment, the time, and day could be written as '12:34 5/6/78'

Solution:

he was genius.

Officials must have thought he was jumping with a hostage, they would never risk giving him a faulty parachute.

Solution:

The person who is dead is B.

The presence of numerous flies around foot B strongly indicates that this individual has passed away.

Solution:

The girl in the red shirt.
As she is eating a sandwich that looks like it's years old, and that might kill her.

Solution:

Felice & Nicolas.

The number corresponding to the atomic number of the elements.
26-3-58 (FE-li-ce) =>Felice
28-27-57-16(Ni-co-la-s) => Nicolas.

Also explained in the video.

Solution:

The poison was not in pills but in water.

Solution:

When blind man "Grandpa" opened his bandages, the train must be passing through the dark tunnel. The man thought he was still blind and hence commit suicide.

Solution:

On phone, using pause button, the teller messaged to her mother "Emergency mother, call help".

Explanation:
all Except one in bold is paused by the teller.
Is there an emergency mother, Call me when you reach home and I will help you with the dinner.