Compiled empirical error-rate figures the paper assembles from the literature (not its own data collection):

quantityvaluecited source
raw MEDLINE retraction rate6.3e-5Cokol, Iossifov et al. 2007
modeled retraction rate under top-tier scrutiny1e-3 – 1e-2Cokol, Iossifov et al. 2007
flawed statistical results in Nature/BMJ sample~11%García-Berthou & Alcaraz 2004
hospital drug-dose error rate~1–2% of administrationsProt 2005; Stubbs 2006; Walsh 2008
spreadsheet audits with errors~88%Panko 1998

The paper notes retraction is only triggered by nontrivial, immediately noticeable flaws, so the retraction rate lower-bounds the serious-flaw rate; 62% of 1982-2002 retractions were unintentional error rather than misconduct (Nath et al. 2006).