What are nine "points of forgery" on Obama's birth certificate?

Maricopa Co. Sheriff's Office: '9 points of forgery' in Obama's birth certificate

"There's at least one person who's still questioning President Barack Obama's birth certificate: Sheriff Joe Arpaio.

"We were trying to clear the president," Arpaio said during a press conference. "It didn't work out that way." "

"Maricopa County Sheriff Joe Arpaio and Chief Investigator Mike Zullo say "nine points of forgery" have been found on President Barack Obama's birth certificate."

"According to officials, there are allegedly nine "points of forgery" on Obama's birth certificate, and words letters and dates, according to officials, were digitally copied and pasted."

"In December, shortly before leaving the Maricopa County Sheriff’s Office, Arpaio announced that his “Cold Case Posse” had found “9 points of forgery” following a five-year investigation of the birth certificate, according to the Arizona Republic."
https://www.washingtonpost.com/news/powerpost/wp/2018/01/11/joe-arpaio-is-back-and-brought-his-undying-obama-birther-theory-with-him/

"Sheriff Joe Arpaio and his team claim to have found one of the source documents from which Obama's birth certificate was allegedly forged"