Liars often share significantly more detail than needed as a way to convince you they are telling the truth.

Unecessary details:
- Big boot vs. little boot.
- Got out of the shower.
- Tries to qualify the statement "anyone knows who's been around my house" about having the dog to seem credible.
- Then the dog suddenly has a ball & drops it right in front of him to get him to pick it up?

-Then he says he is walking through an alleyway, which is weird phrasing, and says "little" I guess to foster the idea that falling down is more likely.
- Then he adds that he is going down the alleyway to get to the bedroom.
- Then he grabs the ball.
- The dog runs.

(Side note: Why? Dogs don't run unless you throw the ball, typically.)

- He makes sure to qualify that he is joking to run after the dog to... um.. grab his tail.

- "What happened was" the dog slid on a throw rug and then Joe apparently trips on the rug the dog slips on.

- Then when he is finished telling the story, he says "that's what happened" to sound matter of fact, but really, it's unncessary and it's only said to add more "credibility."

- Then he says it's not very exciting like he didn't just craft an incredibly complicated scenario with all these random details in.

Body language wise, he laughs at the beginning in a nervous way.

Then he looks down several times during the story and speaks with his eyebrows raised, which is another tell-tale sign of a liar.

He also begins rocking back and forth and leaning in and out while talking, and fidgeting is another sign of lying.

Also, he is gesturing with his hands. According to a psychological study, liars use their hands to express themselves during a story about 50% of the time compared to 25% for those telling the truth.

Furthermore, it's a small difference because he clearly has makeup on, but on the left is before he begins to speak and on the right is after. He clearly loses coloring around his eyes and forehead, which is another sign of lying... when people get pale.

Granted, none of these things are exactly hard science, but body language and speech patterns can tell you quite a bit. That's my interpretation at least.