Solution:

He was a twin brother of one of Joseph's friends.

Solution:

123 - 45 - 67 + 89

Solution:

1. The word "are" is repeated twice.
2. The word "to" is repeated twice.
3. The word mitstakes is misspelled. Its should be mistakes
4. The sentence is missing a punctuation mark and should end with a period/full stop not with semicolon.
5. Since there are only 4 mistakes, therefore, the statement of having five mistakes in the sentence is wrong which is the 5th mistake.

Solution:

All men lose the upper body and getting less for exchange. In this way, the losses of parts, account for one vanished one.

Watch the video for more detail.

Solution:

Its explained in the picture and video

Solution:

Look into the picture.

Solution:

1. Check the list on the tree, It's a list of 6 people.
2. A spider has woven a web near the tent. This means they must have been staying for a few days at least.
3. Two men are having lunch.
The third one is measuring the depth of the river.
The fourth one is fishing.

Solution:

1. The Woman in the portrait is missing a shoe.
2. It can't be sunset at 12 PM.
3. The boy with the guitar has different sleeves.

Solution:

According to the clock, sunset is impossible at this hour.

Solution:

It can be done as shown in the picture below.