In Brisbane it was 16-year-old Naseem Shah who overstepped when Warner tickled a catch behind the wicket when on 56.
At Adelaide, 19-year-old Muhammed Musa was similarly culpable when he had Warner caught in the slips when on 226.
Warner's magic test continued in the field when he took a sharp catch at third slip to remove opener Imam-ul-Haq, who was out for two edging Starc.
On a day of tumbling records, Warner and Marnus Labuschagne combined for 361 runs, the highest second-wicket partnership in tests in Australia.
Steve Smith notched his 7,000th run in his knock of 36, becoming the fastest player to reach the milestone in tests.
Pakistan's Shaheen Afridi took all three of Australia's wickets, including bowling Labuschagne for 162.