The Prime Minister was speaking to members of the press at the EU Summit in Brussels when the precarious oval became dislodged.
The press conference was hastily arranged, with aides reportedly arranging the podium minutes before he spoke to the media.
Cameron was speaking at the press conference after a dinner he had with EU leaders when the wonky British crest had to be stopped from falling off the stage.
The crest was reportedly attached to the lectern with double-sided tape.
The cardboard plaque had to be fixed on to the lectern, but continued to fall out of place.
Cameron has insisted a deal on Britain's EU renegotiation demands can be finalised by February despite warnings from fellow leaders that his proposals could be "unacceptable".
People mocked the incident, with many believing the crest falling was indicative of Cameron's progress with EU talks.
Oh dear ,is this indicative of your progress, Dave ?December 18, 2015
Cameron addressed reporters after a four-hour dinner with EU representative and he has reiterated that there is now a "pathway" to an agreement.
He denied that his demand for a four-year ban on migrants claiming in-work benefits had been swept off the table by counterparts worried about undermining the EU principle of free movement.
But European Council president Donald Tusk said there could be no "discrimination" on the basis of nationality, while German chancellor Angela Merkel promised to protect the "pillars" of the union.
Cameron told the press conference: "I would say today what has happened is we have taken a big step to a better deal for Britain but there is still a lot of hard work to be done, and it is going to need to be done between now and February 18.
"But there is a path through this to a better deal for Britain," the Press Association reports.
While Cameron admitted that nothing was "certain", he said there was clear "momentum" towards a deal, expressing confidence that it could be done by the next European Council summit in February.
During the dinner, Cameron said the "unprecedented" numbers of migrants coming into the UK could result in the British public voting to leave the EU. However, German Chancellor Angela Merkel has already said she would dismiss any deal that was "discriminatory" or counter to the principle of freedom of movement.
After the summit with the British leader, the heads of several Eastern European countries, including Poland, Hungary and the Czech Republic, issued a joint statement, stating that EU laws can not be changed to discriminate against their citizens.
“We consider the freedom of movement one of the fundamental values of the European Union, and proposals regarding this area remain the most sensitive issue for us,” the statement read. “In this respect, we will not support any solutions that would be discriminatory.”
Speaking at a press conference following Cameron's plea, European Council President Donald Tusk said the discussions were "substantive and constructive" but indicated the central plank of Cameron’s renegotiation remains "unacceptable."
Ukip leader Nigel Farage said that the prime minister "got hammered" during his EU talks.
David Cameron came, saw, and got hammered. How many times can his little plans be rejected?— Nigel Farage (@Nigel_Farage) December 18, 2015